[Stoves] Energy in different fuels: was Re: 160 grams of charcoalboils and simmers 5 liters/CF04 Stove

[Richard Stanley]

Sounds great until you get into Kangem or Comitan of Anta and see and 
measure the actual USE of the fuel.

In situ, and in an open burn situation, all you report  say is no doubt 
true ---until you add specifically shaped briquettes, specifically 
those with hollow cores which intensify infrared reflectance,  provide  
an insulated combustion chamber and create an internal draft by their 
inherent design. In this reality they defy your figures in the open 
burn or tin "Jiko" situation typical to most cooking fires today....
  We use two 125 gram briquettes per person per day --of normal agro 
residues (no charcoal or wod product ) in place of 1200 grams of 
fuelwood daily in such environments at tropical environments and  1 - 
2000 ft elevations. In the alti plano + 7,500 ft, where wood use goes 
up to 4 kgs per person per day, the briquette consumption goes up 
accordingly --to as much as 4 Bqs or 500 gms per day .  add charcoal 
fines or sawdust to either environment and the consumption drops even 
below that .

  I think that the application of  the fuel in DAILY use has far much 
more to do with the mentioned empiracally derived fuel values as to 
severely limit their value unless they are  applied to a specific 
stove.
So while the values may have great meaning to improving cooking 
efficiency in the lab,  please do not forget the rest of us working 
outside  the improved stove arena...


wholly yours,
Richard Stanley,
  legacy found.org
>
>
>
> I'm sure that others have a handy list. For the time being let's see 
> if this
> table comes through:
>
>
>
> Energy Value of Various Fuels, from "Cooking Fuel Options Help Guide"
>
> http://bioenergylists.org/en/UNJLCguide
>
>
>
>
> Energy Value of Various Fuels
>
>
> Description:
>
> Heating Value Fuel (MJ/kg):
>
>
> Wet Firewood (60% moisture content)
>
> 8
>
>
> Cow Dung
>
> 10
>
>
> Tree Residues (twigs, leaves, etc.)
>
> 13
>
>
> Agricultural Residues (straw, cotton stalks, etc.)
>
> 13
>
>
> Air Dried Firewood (20% moisture content)
>
> 15
>
>
> Densified Briquettes (wheat straw, rice husks, bagasse, etc.)
>
> 16
>
>
> Oven Dried Firewood (10% moisture content)
>
> 20
>
>
> Peat
>
> 21
>
>
> Charcoal
>
> 28
>
>
> Charcoaled Briquettes
>
> 30
>
>
> Kerosene
>
> 44
>
>
> Biogas
>
> 45
>
>
> Liquid Propane Gas
>
> 46
>
>
> Note: Heating Value = Energy Value = Calorific Content
>
> Add;
>
> Ethanol (LHV) 26.7 MJ/kg
>
> Biodiesel 37.8 MJ/kg
>
>
>
> On Bioenergylists.org go to "Fuels" -> "Properties"
>
> http://bioenergylists.org/en/taxonomy/term/588
>
>
>
> I didn't see a value for "Fireballs"
>
>
>
> The tabulated data is all higher heating value (HHV) or Gross Calorific
> Value (GCV).
>
>
>
> Tom Miles
>
>
>
>
>
>
>
> -----Original Message-----
> From: Paul S. Anderson [mailto:psanders at ilstu.edu]
> Sent: Sunday, July 02, 2006 6:43 PM
> To: tmiles at trmiles.com
> Cc: Stoves at listserv.repp.org
> Subject: Energy in different fuels: was Re: [Stoves] 160 grams of
> charcoalboils and simmers 5 liters/CF04 Stove
>
>
>
> Lanny and all,
>
>
>
> How do XXX grams of charcoal compare with the energy content of a
>
> similar weight
>
> of alcohol, and other stove fuels, NOT counting on the energy 
> used/wasted to
>
> create the charcoal or alcohol, etc?  We note that there are about 15
>
> mJ per kg
>
> of wood (allowing about 20% moisture).
>
>
>
> Do we have a table of this somewhere?  One table I found via Google
>
> that refers
>
> to vehicle fuels gives some comparisons, but not including charcoal, 
> and the
>
> ethanol is E85, and the units are gallons.  Not much use, but you can
>
> see it if
>
> you want to at:
>
> http://www.eere.energy.gov/afdc/progs/fuel_compare.cgi
>
>
>
> But what comparative tables do we have for fuels for stoves?
>
>
>
> Paul
>
> -- 
>
> Paul S. Anderson, Ph.D., Geography professor - Emeritus
>
> Telephone:  USA-309-452-7072 (residence and office)
>
> Internet site:  www.ilstu.edu/~psanders
>
> For my gasifier stoves info, go to:
>
> http://bioenergylists.org/contributors#Paul_Anderson
>
>
>
>
>
>
>
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>
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>
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